Infrared thermal radiation module and infrared plastic welding machine comprising same

Abstract

The utility model relates to the technical field of plastic welding equipment manufacturing, in particular to an infrared thermal radiation module and an infrared plastic welding machine comprising the same. For the infrared heat radiation module, the upper infrared radiation device and the lower infrared radiation device both take the sliding table as a mounting base and are arranged in a back-to-back manner. The upper infrared radiation device comprises a heat insulation bottom plate, a compression-resistant anti-sticking plate, a heat shielding cover and an infrared radiation heating element. The infrared radiation heating element takes a heat insulation bottom plate as a mounting base, and is enclosed by a compression-resistant anti-sticking plate and a heat shielding cover in a cooperative manner. The heat insulation bottom plate is placed and fixed to the sliding table. And the compression-resistant anti-sticking plate is made of a material with an anti-sticking characteristic and is provided with a light-transmitting seam. In practical application, infrared radiation heat can directly act on the welding edge of the plastic welding piece through the light-transmitting seam, so that the phenomenon that heat is ineffectively diffused to a non-working area is avoided, and the thermal forming device is particularly suitable for a thermal forming process of a complex structure.

Description

Technical Field

[0001] This utility model relates to the field of plastic welding equipment manufacturing technology, and in particular to an infrared thermal radiation module and an infrared plastic welding machine including the same. Background Technology

[0002] In industrial fields such as plastic welding, thermoforming, and composite material processing, infrared thermal radiation technology is widely used due to its high efficiency and non-contact heating characteristics.

[0003] Existing infrared thermal radiation modules have revealed numerous technical bottlenecks in practical applications. Most current infrared thermal radiation modules employ an open or semi-open radiation structure, meaning the infrared heating element directly radiates heat into the surrounding space. While this design facilitates installation and maintenance, it also has significant drawbacks: First, infrared light propagates in a scattered manner, with only a small amount of energy effectively acting on the workpiece surface. A large amount of heat is lost during transmission, resulting in extremely low energy utilization. Second, the unconstrained radiation method makes it difficult to precisely control heat distribution. When heating complex-shaped plastic welded parts (such as irregularly shaped parts with grooves or curved surfaces), non-welded areas may warp due to overheating, or the weld strength may decrease due to insufficient heat, leading to a high scrap rate. Furthermore, the lack of anti-stick design in open areas makes them prone to molten plastic adhesion and accumulation under long-term high-temperature operation, affecting infrared light transmission efficiency and requiring periodic shutdowns for cleaning. Therefore, it is urgent for technicians to solve these problems. Utility Model Content

[0004] This invention aims to provide an infrared thermal radiation module that can precisely constrain the infrared radiation path according to the shape of the plastic welded part. It aims to achieve precise matching between the infrared light and the welding area of ​​the plastic welded part while ensuring efficient heat transfer, thereby avoiding ineffective heating and improving energy utilization.

[0005] This utility model relates to an infrared thermal radiation module, including a sliding stage, an upper infrared radiation device, and a lower infrared radiation device. Both the upper and lower infrared radiation devices use the sliding stage as their mounting base and are positioned opposite each other. The upper and lower infrared radiation devices have the same design structure. The upper infrared radiation device includes a heat-insulating base plate, a pressure-resistant anti-stick plate, a heat shield, and an infrared radiation heating element. The infrared radiation heating element uses the heat-insulating base plate as its mounting base and is enclosed by the pressure-resistant anti-stick plate and the heat shield. The heat-insulating base plate rests on the sliding stage and is detachably fixed as a single unit. The pressure-resistant anti-stick plate is made of a material with anti-adhesion properties and has a light-transmitting slit that matches the shape of the welding edge of the plastic weldment.

[0006] As a further improvement to the technical solution disclosed in this utility model, a series of bridging arms are formed along the extension direction of the light-transmitting slit.

[0007] As a further improvement to the technical solution disclosed in this utility model, the pressure-resistant and anti-stick plate is made of alumina ceramic or silicon nitride ceramic, or the base material of the pressure-resistant and anti-stick plate is a metal plate, and its working surface is subjected to nitriding treatment, Teflon coating or nano-coating process.

[0008] As a further improvement to the technical solution disclosed in this utility model, the upper infrared radiation device also includes a support assembly. After the pressure-resistant anti-stick plate and the heat shield are assembled, the entire structure is supported by the support assembly. The support assembly is detachably fixed to the heat-insulating base plate.

[0009] As a further improvement to the technical solution disclosed in this utility model, the support assembly is composed of multiple support columns arranged in a rectangular array. The pressure-resistant and anti-stick plate is supported by multiple support columns working together and is fastened and fixed by fasteners. The heat shield is composed of multiple shielding plates connected end to end, each with a base fixed by the pressure-resistant and anti-stick plate.

[0010] As a further improvement to the technical solution disclosed in this utility model, the pressure-resistant anti-stick plate is formed with waist-shaped mounting holes adapted to fasteners. The extension direction of the waist-shaped mounting holes located at different positions all points towards the center of the pressure-resistant anti-stick plate.

[0011] As a further improvement to the technical solution disclosed in this utility model, the shielding plate adopts microstructure processing technology to form a honeycomb-shaped groove array on its inner wall and is coated with a silver-aluminum composite film.

[0012] As a further improvement to the technical solution disclosed in this utility model, the heat insulation base plate adopts a multi-layer composite structure, and along the direction away from the infrared radiation heating element, it is composed of a ceramic fiber layer, a vacuum insulation layer and an aerogel layer in sequence.

[0013] As a further improvement to the technical solution disclosed in this utility model, an infrared temperature sensor is installed inside the heat shield. The infrared temperature sensor is used to monitor the real-time temperature of a specific area on the welding edge of the plastic welding part, and it is connected to the PLC control system. The PLC control system automatically adjusts the power of the infrared radiation heating element according to the preset temperature curve.

[0014] In practical applications, the infrared thermal radiation module disclosed in this utility model can achieve at least the following beneficial technical effects, specifically:

[0015] 1) The heat generated by the infrared radiation heating element can be directly applied to the welding edge of the plastic welding part through the light-transmitting slit, thereby avoiding the phenomenon of ineffective heat diffusion to non-working areas. Especially in the thermoforming process of complex structures, the light-transmitting slit can be precisely cut out for special parts such as grooves and protrusions on the shell, radiating only to the area that needs to be heated, avoiding the ineffective heat absorption of non-forming areas when heating a flat surface.

[0016] 2) Combining the anti-adhesion properties of the pressure-resistant and anti-sticking board, it can effectively prevent molten plastic from adhering to the edges of the light-transmitting seam and affecting the normal transmission of light, thus ensuring the stability and continuity of heat transfer;

[0017] 3) With the help of the heat shield, the secondary reflection of light can be guided so that infrared light can be evenly and concentratedly covered in the welding area of ​​the plastic welding parts, and the temperature distribution error can be controlled within a reasonable range. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a three-dimensional schematic diagram of the infrared plastic welding machine disclosed in this utility model (with the double protective doors hidden).

[0020] Figure 2 yes Figure 1 The front view.

[0021] Figure 3 This is a three-dimensional schematic diagram of the infrared plastic welding machine disclosed in this utility model (with the double protective doors and the frame hidden).

[0022] Figure 4 This is a three-dimensional schematic diagram of the infrared thermal radiation module disclosed in this utility model.

[0023] Figure 5 yes Figure 4 The front view.

[0024] Figure 6 This is a three-dimensional schematic diagram of the upper infrared radiation device in the infrared thermal radiation module disclosed in this utility model.

[0025] Figure 7 This is also a three-dimensional schematic diagram of the upper infrared radiation device in the infrared thermal radiation module disclosed in this utility model (with the anti-pressure and anti-stick plate hidden).

[0026] Figure 8This is a three-dimensional schematic diagram of the pressure-resistant and anti-stick plate in the infrared thermal radiation module disclosed in this utility model.

[0027] Figure 9 yes Figure 8 A magnified view of part of I.

[0028] 1-Frame; 2-Infrared thermal radiation module; 21-Sliding stage; 22-Upper infrared radiation device; 221-Heat insulation base plate; 222-Pressure-resistant and anti-stick plate; 2221-Light transmission seam; 2222-Bridging arm; 2223-Oval mounting hole; 223-Heat shielding cover; 2231-Shielding plate; 224-Infrared radiation heating element; 225-Support assembly; 2251-Support column; 23-Lower infrared radiation device; 3-Upper plastic welding part clamping fixture; 4-Lower plastic welding part clamping fixture; 5-First drive platform; 6-Second drive platform; 7-Third drive platform. Detailed Implementation

[0029] In the description of this utility model, it should be understood that the terms "left", "right", "front", "rear", "upper", "lower", etc., indicate the position or positional relationship based on the position or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, or be constructed and operated in a specific position, and therefore should not be construed as a limitation of this utility model.

[0030] The present invention will be further described in detail below with reference to specific embodiments, such as... Figures 1-3As shown in the diagram, the infrared plastic welding machine mainly consists of a frame 1, an infrared heat radiation module 2, an upper plastic welding part clamping fixture 3, a lower plastic welding part clamping fixture 4, a first drive platform 5, a second drive platform 6, and a third drive platform 7. The frame 1, serving as the basic framework of the infrared plastic welding machine, is typically made of high-strength steel, providing stable support for all components. The first drive platform 5, second drive platform 6, and third drive platform 7 are used to transport the infrared heat radiation module 2, the upper plastic welding part clamping fixture 3, and the lower plastic welding part clamping fixture 4 respectively, with the frame 1 serving as the installation and fixing foundation for all three. The upper and lower plastic welding part clamping fixtures 3 and 4 are used to position and clamp the plastic welding parts. The infrared heat radiation module 2, as the core heating component, emits infrared rays that allow the surface of the plastic welding part to absorb energy and convert it into heat energy, thus melting the area to be welded. During the operation of the infrared plastic welding machine, after the infrared heat radiation module 2 is translated to the preset working position by the driving force from the first drive platform 5, the second drive platform 6 and the third drive platform 7 move synchronously, respectively driving the upper plastic welding part clamping fixture 3 and the lower plastic welding part clamping fixture 4 to perform displacement movements towards the infrared heat radiation module 2. When the distance between the upper plastic welding part clamping fixture 3 and the lower plastic welding part clamping fixture 4 and the infrared heat radiation module 2 reaches the preset value, the second drive platform 6 and the third drive platform 7 both stop moving. At this time, under the continuous radiation of infrared rays, the welding edges of the two paired plastic welding parts gradually heat up to a molten state, laying the foundation for the subsequent top-contact welding process.

[0031] In infrared plastic welding machines, the infrared heat radiation module 2 plays a core driving role, and its functionality deeply affects the overall performance of the equipment and the welding quality. For example... Figure 4 , Figure 5 As shown, the infrared thermal radiation module 2 mainly consists of a sliding platform 21, an upper infrared radiation device 22, and a lower infrared radiation device 23. The sliding platform 21 is carried by the first drive platform 5 and performs translational movement along the front-to-back direction when subjected to traction force. The upper infrared radiation device 22 and the lower infrared radiation device 23 are both mounted on the sliding platform 21 and are placed facing away from each other.

[0032] Furthermore, such as Figure 4 , Figure 5 As shown, the upper infrared radiation device 22 and the lower infrared radiation device 23 have similar / identical design structures and installation methods. Therefore, for the sake of saving space, only the upper infrared radiation device 22 will be described in detail here.

[0033] like Figure 6 , Figure 7As shown, the upper infrared radiation device 22 mainly consists of several parts, including a heat-insulating base plate 221, a pressure-resistant anti-stick plate 222, a heat shield 223, and an infrared radiation heating element 224. The infrared radiation heating element 224 uses the heat-insulating base plate 221 as its mounting base and is enclosed by the pressure-resistant anti-stick plate 222 and the heat shield 223. The heat-insulating base plate 221 rests on the sliding table 21 and is fixed as a single unit in a detachable manner. The pressure-resistant anti-stick plate 222 is made of a material with anti-adhesion properties and has a light-transmitting slit 2221 that matches the shape of the welding edge of the plastic weldment (e.g., ...). Figure 8 (As shown in the figure). The pressure-resistant anti-stick plate 222 is preferably made of alumina ceramic or silicon nitride ceramic, or the base material of the pressure-resistant anti-stick plate 222 is a metal plate, and its working surface is treated with nitriding, Teflon coating or nano-coating process.

[0034] By adopting the above technical solution, on the one hand, the heat generated by the infrared radiation heating element 224 can be directly applied to the welding edge of the plastic welding part through the light-transmitting slit 2221, thereby avoiding the phenomenon of ineffective heat diffusion to non-working areas. Especially in the thermoforming process of complex structures, the light-transmitting slit can be precisely cut out for special parts such as grooves and protrusions on the shell, radiating only the area that needs to be heated, avoiding ineffective heat absorption in non-forming areas when heating a flat surface. On the other hand, in conjunction with the secondary reflection and guidance of light by the heat shield 223, the infrared light can be uniformly and concentratedly covered to cover the welding area of ​​the plastic welding part, and the temperature distribution error can be controlled within a reasonable range.

[0035] Furthermore, it should be noted that thanks to the anti-adhesion properties of the pressure-resistant anti-stick plate 222, molten plastic can be effectively prevented from adhering to the edge of the light-transmitting seam 2221 and affecting the normal transmission of light, thus ensuring the stability and continuity of heat transfer.

[0036] It is known, based on common knowledge, that the light-transmitting slit 2221 weakens the overall strength of the board to some extent. Furthermore, during long-term use, if the light-transmitting slit 2221 deforms due to stress, the projection path of the infrared light will shift, affecting the precise heating of the plastic welding parts. Therefore, as a further optimization of the above technical solution, such as... Figure 8 , Figure 9 As shown, a series of bridging arms 2222 are formed along the extension direction of the light-transmitting slit 2221.

[0037] like Figure 6 , Figure 7As shown, the upper infrared radiation device 22 is further equipped with a support component 225. After the pressure-resistant anti-stick plate 222 and the heat shield 223 are assembled, the entire structure is supported by the support component 225. The support component 225 is detachably fixed to the heat insulation base plate 221 and consists of multiple support columns 2251 arranged in a rectangular array. The pressure-resistant anti-stick plate 222 is supported by multiple support columns 2251 working together and is secured by fasteners (not shown in the figure). During equipment assembly, the support columns 2251 can be fixed to the heat insulation base plate 221 in a preset array first, and then the pressure-resistant anti-stick plate 222 and the heat shield 223 can be quickly installed and locked with fasteners to complete the overall assembly. Compared with the traditional integrated structure, the assembly time is significantly shortened.

[0038] Similarly, Figure 6 , Figure 7 As shown, the heat shield 223 is composed of multiple shielding plates 2231 connected end to end, each fixed to a base by a pressure-resistant and non-stick plate 222. Thus, when processing plastic welded parts of different dimensions, the combination of the shielding plates 2231 can be adjusted simultaneously by replacing the pressure-resistant and non-stick plates 222 with different light-transmitting slit shapes to quickly adapt to new heating requirements.

[0039] like Figure 8 As described above, the pressure-resistant anti-stick plate 222 is formed with waist-shaped mounting holes 2223 adapted to fasteners. The extension direction of the waist-shaped mounting holes 2223 located at different positions all points towards the center of the pressure-resistant anti-stick plate 222. When installing the pressure-resistant anti-stick plate 222, the operator can fine-tune its relative position to precisely align the light-transmitting slit 2221 with the welding area of ​​the plastic welded part, so as to effectively compensate for the positional offset caused by processing errors and assembly deviations.

[0040] To further optimize the above technical solution by efficiently reflecting infrared light and improving heat utilization, the shielding plate 2231 preferably employs microstructure processing technology to form a honeycomb-shaped groove array on its inner wall and coat it with a silver-aluminum composite film. In practical applications, the silver-aluminum composite film not only reflects infrared light but also blocks heat from being transferred to the outside in the form of thermal radiation, reducing heat loss from the outside of the heat shield 223.

[0041] It is known that the heat dissipation performance of the heat-insulating base plate 221 has a crucial impact on the operating accuracy of the infrared plastic welding machine. It is used to prevent residual heat from diffusing into the sliding stage 21, thus avoiding deformation of the sliding stage 21 due to heat. Therefore, as a further optimization of the above technical solution, the heat-insulating base plate 221 adopts a multi-layer composite structure, and along the direction away from the infrared radiation heating element 224, it is sequentially composed of a ceramic fiber layer, a vacuum insulation layer, and an aerogel layer. Thus, the three layers progressively form a strong heat insulation barrier. The ceramic fiber layer, as the first layer subjected to infrared thermal radiation, possesses high temperature resistance and low thermal conductivity, and can quickly absorb and disperse initial heat. The middle vacuum insulation layer utilizes the near-zero heat conduction characteristic of the vacuum environment to further block heat transfer. The bottom aerogel layer has an extremely low thermal conductivity, effectively preventing residual heat from diffusing into the sliding stage 21.

[0042] Finally, it should be noted that an infrared temperature sensor (not shown in the figure) is installed inside the heat shield 223. The infrared temperature sensor monitors the real-time temperature of a specific area on the welding edge of the plastic weldment and is connected to the PLC control system. The PLC control system automatically adjusts the power of the infrared radiant heating element 224 according to a preset temperature curve. Thus, in practical applications, the infrared temperature sensor can monitor the real-time temperature of a specific area on the welding edge of the plastic weldment at close range without contact, with a temperature measurement accuracy of ±1℃. When the sensor detects that the local temperature is too high, the infrared radiant heating element 224 quickly reduces its operating power to prevent over-melting of the material; conversely, if the temperature is insufficient, it quickly replenishes heat by increasing its operating power to ensure that the welding area is always within the optimal process temperature range.

[0043] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An infrared thermal radiation module, comprising a sliding stage, an upper infrared radiation device, and a lower infrared radiation device; wherein the upper infrared radiation device and the lower infrared radiation device are both mounted on the sliding stage and are positioned opposite each other, characterized in that... The upper infrared radiation device and the lower infrared radiation device have the same design structure; the upper infrared radiation device includes a heat-insulating base plate, a pressure-resistant anti-stick plate, a heat shield, and an infrared radiation heating element; the infrared radiation heating element uses the heat-insulating base plate as its mounting base, and is enclosed by the pressure-resistant anti-stick plate and the heat shield in cooperation; the heat-insulating base plate is placed on the sliding platform and is fixed as a whole in a detachable manner; the pressure-resistant anti-stick plate is made of a material with anti-adhesion properties, and has a light-transmitting slit that matches the welding edge of the plastic welding part.

2. The infrared thermal radiation module according to claim 1, characterized in that, A series of bridging arms are formed along the extension direction of the light-transmitting slit.

3. The infrared thermal radiation module according to claim 2, characterized in that, The pressure-resistant and anti-stick plate is made of alumina ceramic or silicon nitride ceramic, or the base material of the pressure-resistant and anti-stick plate is a metal plate, and its working surface is treated with nitriding, Teflon coating or nano-coating process.

4. The infrared thermal radiation module according to any one of claims 1-3, characterized in that, The upper infrared radiation device also includes a support component; after the pressure-resistant and anti-stick plate and the heat shield are assembled, the whole is supported by the support component; and the support component is fixed to the heat insulation base plate in a detachable manner.

5. The infrared thermal radiation module according to claim 4, characterized in that, The support assembly consists of multiple support columns arranged in a rectangular array; the pressure-resistant and anti-stick plate is supported by multiple support columns working together and is fastened and fixed by fasteners; the heat shield is composed of multiple shielding plates connected end to end and all of which are fixed to the foundation by the pressure-resistant and anti-stick plate.

6. The infrared thermal radiation module according to claim 5, characterized in that, The pressure-resistant and anti-stick plate is formed with waist-shaped mounting holes adapted to the fasteners; the extension direction of the waist-shaped mounting holes located at different positions all points to the center of the pressure-resistant and anti-stick plate.

7. The infrared thermal radiation module according to claim 5, characterized in that, The shielding plate is made using microstructure processing technology to form a honeycomb-shaped groove array on its inner wall and is coated with a silver-aluminum composite film.

8. The infrared thermal radiation module according to any one of claims 1-3, characterized in that, The heat insulation base plate adopts a multi-layer composite structure, and along the direction away from the infrared radiation heating element, it is composed of a ceramic fiber layer, a vacuum insulation layer and an aerogel layer in sequence.

9. The infrared thermal radiation module according to any one of claims 1-3, characterized in that, An infrared temperature sensor is installed inside the heat shield; the infrared temperature sensor is used to monitor the real-time temperature of a specific area on the welding edge of the plastic welding part, and it is connected to the PLC control system; the PLC control system automatically adjusts the power of the infrared radiation heating element according to the preset temperature curve.

10. An infrared plastic welding machine, characterized in that, Includes the infrared thermal radiation module as described in any one of claims 1-9.

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